#include "apue.h"
#include <dirent.h> 
int main(int argc, char *argv[]){
	DIR *dp;
	struct dirent *dirp;

	if(argc != 2)
		err_quit("usage:ls directory_name");
	if((dp=opendir(argv[1])) == NULL)
		err_sys("can't open %s",argv[1]);
	while((dirp = readdir(dp)) != NULL)
		printf("%s\n",dirp->d_name);
	closedir(dp);
	exit(0);
}
